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manual abstract
Tankless water heaters have a pressure loss which must be considered in the system design. Reference the pressure loss curve for the heater model being used to determine the pump size for the desired recovery rate. For recommended pump sizes use the table below. Additional pressure losses in plumbing between the Heater(s) and the storage tank must also be taken into consideration. The specified pump size is to provide maximum recovery of the storage tank. A smaller pump size may be used, but could result in longer recovery time of the tank. Please contact the Tech Services department with any questions on pump sizing. NOTE: Only use pumps of brass or stainless steel construction. Do not use pumps of iron construction as they will oxidize and clog the inlet filter on the appliance. Pump Flow Requirements Number of Tankless Water Heaters 705/505 305 1 6 gpm @ 30' head 5 gpm @ 25' head 2 12 gpm @ 30' head 10 gpm @ 25' head 3 18 gpm @ 30' head 15 gpm @ 25' head 4 24 gpm @ 30' head 20 gpm @ 25' head 5 30 gpm @ 30' head 25 gpm @ 25' head 6 36 gpm @ 30' head 30 gpm @ 25' head 7 42 gpm @ 30' head 35 gpm @ 25' head 8 48 gpm @ 30' head 40 gpm @ 25' head 9 54 gpm @ 30' head 45 gpm @ 25' head 10 60 gpm @ 30' head 50 gpm @ 25' head 11 66 gpm @ 30' head 55 gpm @ 25' head 12 72 gpm @ 30' head 60 gpm @ 25' head 13 78 gpm @ 30' head 65 gpm @ 25' head 14 84 gpm @ 30' head 70 gpm @ 25' head 15 90 gpm @ 30' head 75 gpm @ 25' head 7 Pressure Loss Curves Pressure Loss (ft head) Pressure Loss Curves Pressure Loss (ft head) 45.0 40.0 8 Pressure Loss (psi) 705 305i505 305e 60.0 35.0 50.0 30.0 40.0 25.0 20.0 30.0 15.0 20.0 10.0 10.0 5.0 0.0 0.0 01 234 56 78910 11 Water Flow (gpm) G as S upply 3/ 4 " C old W ater S upply Line3/4" Hot Water Supply Line TanklessWater Heater TanklessEquipment ListTanklessWater Heaters QTY1 Drawing Number:WH-1 Domestic Hot Water - Standard Installation1 Tankless Water HeaterPreferred Piping Installation Drawing Date: June 11, 2007 This is not an engineering drawing; it notas a replacement for professional engineering This drawing is not intended to describe It is up to thecontractor or engineer to determine andconfiguration of the particular The drawing doesnot imply compliance with It is theresponsibility of the engineer isin accordance with Confer with local buildingofficials before installation. Key Pressure Relief Valve 3/ 4" Ball Valve3/ 4" UnionCheck Valve S Pressure RegulatorCirculating PumpSolenoid Valve Boiler Drain Valve 9 Sub 1Primary TanklessEquipment List QTY Tankless 2 Water HeatersElectronic Connection ** Refer to Tankless Accessories and Model Applicability for electronic connection details. Cold Water Supply Line Gas Supply Hot Water Supply Line TanklessWater Heater TanklessWater Heater Drawing Number:WH-2 Domestic Hot Water - Standard Installation2 Tankless Water HeatersPreferred Piping Installation Drawing Date: February 27, 2008 This is not an engineering drawing; it notas a replacement for professional engineering This dra...
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